Cotech DB7404 - Spark Plug

10
ENGLISH
0,6–0,8 mm
Spark plug
Note: Let theengine cool before unscrewing and removing thespark plug. Boththespark plug and muffler
become very hot after use. Check thespark plug before every season. Changewhen necessary.
1. Remove thespark plug cable from thespark plug. Donot pull thecable but rather
grip thespark plug cap and wiggle it back and forth to loosen it.
2. Use aspark plug spanner to remove it from its socket.
3. Check theelectrodes for any visible damage and clean with asteel brush
whennecessary.
4. Check that theelectrode gap is between 0.6–0.8 mm. Specialtools for gapping
areavailable for purchase separately.
5. Try to screw thespark plug partway in by hand to make sure thethreads catch
correctly. Tightenusing aspark plug spanner.
6. Washers on thenew spark plug must be compressed during installation.
Tightena½ turn extra after thespark plug is securely in place to compress
thewasher and create aproper seal.
7. Turn a¼ turn extra if you are using theexisting spark plug.
Handy hint: Thread asmall piece of PVC hose to thespark plug tip to make it easier to insert and thread into
the socket.
Clutch lever wire adjustment
The wire becomes slack after some usage and it may be necessary to adjust it from time to time.
1. Unscrew thewire bracket from thehandle as previously described under theInstallation section.
2. Move thewire to theupper hole.
3. Screw thewire bracket back on.
4. Start thesnow blower and check for proper operation.
5. If theclutch lever still doesn’t work satisfactorily thedrive belt should be changed.
Changing the Drive Belt
Disassembly
1. Remove theprotective
cover by removing
the4retaining screws.
2. Grab thebelt in front of thefeed
screw’s pulley and remove it
from thepulley.
3. Press thetensioner wheel down
to release thebelt from thebelt
tension tab which presses
against thefeed screw’s pulley.
Reinstallation
1. Press thetensioner wheel down to allow thebelt enough room under thebelt tension tab to be reinstalled.
2. Release thetensioner wheel and re-install thebelt in reverse order. Finishby threading thebelt to thebottom
of thefeed screw pulley.
3. Adjust thewire by attaching it to theclutch lever’s bottom hole and check for proper functioning.
4. Move thewire to theupper hole if necessary.
5. Replace theprotective cover.